Culloch



4 SheetsSheet 1.

(No Model.)

J. MUG. MoCULLOOI-I.

STEAM BOILER.

No. 313,944. Patented Mar. 17, 1885.

4 Sheets-$heet 2.

(No Model.)

J. McG. MoOULLOOH.

STEAM BOILER.

No. 313,944. Patented Mar. 17, 1885.

FIE C GDQOOQOQOQO Win- 255 E5 N. PETERS. PhoXo-Lilhngmphor. Washington D. C.

(No Model.) 4 Sheets-Sheet 3Q J. MQG. MQOULLOOH.

STEAM BOILER.

No. 313,944. Patented Mar. 17, 1885.

WITI SSEB v INEqTur: fi gg w (No Model.) 4 Sheets-Sheet 4. J.MOG.1V[0CULLOGH.

STEAM BOILER. No. 313,944. Patented Mar. 17, 1885 UNITED STATES PATENT Orrics.

JAMES MOG. MOCULLOOH, OF GARSTON, COUNTY OF LANCASTER, ENGLAND.

STEAM-BOILER.

SPECIFICATION forming part of Letters Patent No. 313,944, dated March 1'7, 18 85.

Application filed September 8, 1884. (No model.) Patented in England August 19, 1884, No. 11,414.

To all whom it may concern Be it known that 1, JAMES McGowan Mo- CULLooH, a subject of the Queen of Great Britain, residing at Garston, in the county of Lancaster and Kingdom of England, have invented certain new and useful Improvements in Steam-Boilers, for which I have applied for Letters-Patent in England dated August 19, 1884, No. 11,414.

This invention has for its object a boiler with very large and effective heating-surface, easy of construction and of repair, and with good circulation.

Referring to the drawings, Figures 1 and 2 are transverse and longitudinal sections of a boiler with two furnaces; Figs. 3 and 4, longitudinal and transverse sections showing a modification applicable where there is only one furnace and one return-flue; Fig. 5,a modification showing one furnace and two returnfiues; Fig. 6, an enlarged view showing aconical flue with cylindrical ends.

The invention consists, essentially, first, in a furnace flue or fines extending the full length of the boiler, and in height from the bottom or from near the bottom of the boiler to a little below the minimum water-level of the boiler; second, in piercing the upper portion of this fine or flues with a series of trans verse slightly-inclined and preferably conical water-tubes; third, in bringing the return flue or flues back alongside the furnace-flue, but below the level of the water-tubes in the furnace-flue; fourth, in placing a series of preferably conical vertical or nearly vertical water-tubes through this return-tube.

Referring to the drawings, in which like letters refer to like parts throughout, A is the boiler-shell, preferably circular, but other forms, if well stayed, could be used; B, furnace-flue,preferably round-topped when space admits of it, as in Figs. 1 and 2; but in the case of small boilers, where it would reduce the available number of transverse tubes too much, I make it flat-topped, ornearly so, and well stayed; O, fire-bars of any ordinary construction; D, bridge; E, transverse tubes, preferably conical, with bottom surface about level; but where parallel tubes are used I incline them upward somewhat toward the space over the return-flue. I prefer to so design the boiler that at even the small ends of all tubes there shall be a vacancy beyond of about eighteen inches in breadth to enable a man to go in and calk or unscrew or tighten them. The tubes I prefer to form with a thread screwed into each tube-plate, and having a nut or nuts at each end to still further hold the tube and make a tight joint. If nuts be used, the tubes should be parallel where they enter the tube-plate, and a little on each side, so as to give the nuts fair play. The tubes thus act as stays, even though conical. F, back end common to all lines; G, return-flue. The partition between the furnace and returnfiue can be a simple plate, preferably incased in fire-clay, a fire-brick wall, or a thin feed-Water-heating space. It is of course omitted altogether at F. It is shown entirely removed in the longitudinal view. In some cases I may, however, join the fines outside the boiler. H, vertical tubes, preferably conical, and screwed at each end into the tube-plates, as above-described; I, space sufficiently wide and deep to enable a repairer to withdraw the tubes through it; J, water-space at small or lower end of tubes, preferably about eighteen inches wide, for working in; K, man-hole; L, staying devices to prevent collapse of flue; M, water-chamber attached externally to back end of flue, forming a feed-heater and chest, where any sediment from the feed-water may collect. Not being a vital part of the boiler, the chest can be renewed at small cost. The

object is, further, to prevent overheating of the back plate.

I am aware that a conical or tapering water-tube threaded at its ends is not broadly new; but, so far as I am aware, such. threaded ends have never before been made cylindrical on the exterior, but have, instead, had the same taper as the body of the tube.

I am also aware that a feed-water heater has been attached to the rear end of a boiler having a furnace-flue and return-flue united at the back end; but in that case only a portion of the end plate was thus protected, a removable door being made to close and form. a considerable portion of each end.

I claim as my invention 1. A steam boiler having a forward and return flue opening into each other at the one scribed.

end, but separated from each other by a thin partition except at that end, and each pierced with transverse tubes at right angles,or nearly so, to those of the other.

2. The combination of a furnace-flue having transverse tubes in its upper part, with a return-fine alongside but not sufficiently high tointerfere with the replacing of the transverse tubes, substantially as described.

3. In a boiler, a longitudinal furnace-fine having a series of transverse tubes in its upper part, in combination with a longitudinal return-fine of less height than the lowest part of the tubes of the furnace-flue. and fitted with vertical water-tubes, substantially as de- 4. In a boiler, a water-space, I, having two or more of its sides formed by fines pierced with water-tubes opening into said space, the Width of the clear space in front of the tubes being greater than the length of said tubes,

*whereby the tubes can be withdrawn into said space whenrequir'ed, and the steam escaping from said tubes will have free opportunity to escape, substantially as described.

5. In combination With a boiler having a main furnace-flue and a return-flue united at the back end, a feed-water chamber attached to and covering the entire rear end, whereby the end plate is completely protected against the fire and a large heating-surface is secured for the feed-water chamber.

6. A steanrboiler having a primary furnace-flue of substantially square section, from adjacent sides ofwhich project the tubulons return-flue spaces, and open freely to the primary fine, and'each projecting flue-space having its tubes opening out into the rectangle formed by the two projections.

In testimony whereofI have signed my name to this specification in the presence of two subscribing witnesses.

JAMES M. MOOULLOOH.

Witnesses:

WM. P. THOMPSON, JOHN HAYES. 

